1#ifndef _LINUX_MM_TYPES_H 2#define _LINUX_MM_TYPES_H 3 4#include <linux/auxvec.h> 5#include <linux/types.h> 6#include <linux/threads.h> 7#include <linux/list.h> 8#include <linux/spinlock.h> 9#include <linux/prio_tree.h> 10#include <linux/rbtree.h> 11#include <linux/rwsem.h> 12#include <linux/completion.h> 13#include <linux/cpumask.h> 14#include <linux/page-debug-flags.h> 15#include <asm/page.h> 16#include <asm/mmu.h> 17 18#ifndef AT_VECTOR_SIZE_ARCH 19#define AT_VECTOR_SIZE_ARCH 0 20#endif 21#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) 22 23struct address_space; 24 25#define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) 26 27#if USE_SPLIT_PTLOCKS 28typedef atomic_long_t mm_counter_t; 29#else /* !USE_SPLIT_PTLOCKS */ 30typedef unsigned long mm_counter_t; 31#endif /* !USE_SPLIT_PTLOCKS */ 32 33/* 34 * Each physical page in the system has a struct page associated with 35 * it to keep track of whatever it is we are using the page for at the 36 * moment. Note that we have no way to track which tasks are using 37 * a page, though if it is a pagecache page, rmap structures can tell us 38 * who is mapping it. 39 */ 40struct page { 41 unsigned long flags; /* Atomic flags, some possibly 42 * updated asynchronously */ 43 atomic_t _count; /* Usage count, see below. */ 44 union { 45 atomic_t _mapcount; /* Count of ptes mapped in mms, 46 * to show when page is mapped 47 * & limit reverse map searches. 48 */ 49 struct { /* SLUB */ 50 u16 inuse; 51 u16 objects; 52 }; 53 }; 54 union { 55 struct { 56 unsigned long private; /* Mapping-private opaque data: 57 * usually used for buffer_heads 58 * if PagePrivate set; used for 59 * swp_entry_t if PageSwapCache; 60 * indicates order in the buddy 61 * system if PG_buddy is set. 62 */ 63 struct address_space *mapping; /* If low bit clear, points to 64 * inode address_space, or NULL. 65 * If page mapped as anonymous 66 * memory, low bit is set, and 67 * it points to anon_vma object: 68 * see PAGE_MAPPING_ANON below. 69 */ 70 }; 71#if USE_SPLIT_PTLOCKS 72 spinlock_t ptl; 73#endif 74 struct kmem_cache *slab; /* SLUB: Pointer to slab */ 75 struct page *first_page; /* Compound tail pages */ 76 }; 77 union { 78 pgoff_t index; /* Our offset within mapping. */ 79 void *freelist; /* SLUB: freelist req. slab lock */ 80 }; 81 struct list_head lru; /* Pageout list, eg. active_list 82 * protected by zone->lru_lock ! 83 */ 84 /* 85 * On machines where all RAM is mapped into kernel address space, 86 * we can simply calculate the virtual address. On machines with 87 * highmem some memory is mapped into kernel virtual memory 88 * dynamically, so we need a place to store that address. 89 * Note that this field could be 16 bits on x86 ... ;) 90 * 91 * Architectures with slow multiplication can define 92 * WANT_PAGE_VIRTUAL in asm/page.h 93 */ 94#if defined(WANT_PAGE_VIRTUAL) 95 void *virtual; /* Kernel virtual address (NULL if 96 not kmapped, ie. highmem) */ 97#endif /* WANT_PAGE_VIRTUAL */ 98#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS 99 unsigned long debug_flags; /* Use atomic bitops on this */ 100#endif 101}; 102 103/* 104 * A region containing a mapping of a non-memory backed file under NOMMU 105 * conditions. These are held in a global tree and are pinned by the VMAs that 106 * map parts of them. 107 */ 108struct vm_region { 109 struct rb_node vm_rb; /* link in global region tree */ 110 unsigned long vm_flags; /* VMA vm_flags */ 111 unsigned long vm_start; /* start address of region */ 112 unsigned long vm_end; /* region initialised to here */ 113 unsigned long vm_top; /* region allocated to here */ 114 unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ 115 struct file *vm_file; /* the backing file or NULL */ 116 117 atomic_t vm_usage; /* region usage count */ 118}; 119 120/* 121 * This struct defines a memory VMM memory area. There is one of these 122 * per VM-area/task. A VM area is any part of the process virtual memory 123 * space that has a special rule for the page-fault handlers (ie a shared 124 * library, the executable area etc). 125 */ 126struct vm_area_struct { 127 struct mm_struct * vm_mm; /* The address space we belong to. */ 128 unsigned long vm_start; /* Our start address within vm_mm. */ 129 unsigned long vm_end; /* The first byte after our end address 130 within vm_mm. */ 131 132 /* linked list of VM areas per task, sorted by address */ 133 struct vm_area_struct *vm_next; 134 135 pgprot_t vm_page_prot; /* Access permissions of this VMA. */ 136 unsigned long vm_flags; /* Flags, see mm.h. */ 137 138 struct rb_node vm_rb; 139 140 /* 141 * For areas with an address space and backing store, 142 * linkage into the address_space->i_mmap prio tree, or 143 * linkage to the list of like vmas hanging off its node, or 144 * linkage of vma in the address_space->i_mmap_nonlinear list. 145 */ 146 union { 147 struct { 148 struct list_head list; 149 void *parent; /* aligns with prio_tree_node parent */ 150 struct vm_area_struct *head; 151 } vm_set; 152 153 struct raw_prio_tree_node prio_tree_node; 154 } shared; 155 156 /* 157 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma 158 * list, after a COW of one of the file pages. A MAP_SHARED vma 159 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack 160 * or brk vma (with NULL file) can only be in an anon_vma list. 161 */ 162 struct list_head anon_vma_node; /* Serialized by anon_vma->lock */ 163 struct anon_vma *anon_vma; /* Serialized by page_table_lock */ 164 165 /* Function pointers to deal with this struct. */ 166 struct vm_operations_struct * vm_ops; 167 168 /* Information about our backing store: */ 169 unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE 170 units, *not* PAGE_CACHE_SIZE */ 171 struct file * vm_file; /* File we map to (can be NULL). */ 172 void * vm_private_data; /* was vm_pte (shared mem) */ 173 unsigned long vm_truncate_count;/* truncate_count or restart_addr */ 174 175#ifndef CONFIG_MMU 176 struct vm_region *vm_region; /* NOMMU mapping region */ 177#endif 178#ifdef CONFIG_NUMA 179 struct mempolicy *vm_policy; /* NUMA policy for the VMA */ 180#endif 181}; 182 183struct core_thread { 184 struct task_struct *task; 185 struct core_thread *next; 186}; 187 188struct core_state { 189 atomic_t nr_threads; 190 struct core_thread dumper; 191 struct completion startup; 192}; 193 194struct mm_struct { 195 struct vm_area_struct * mmap; /* list of VMAs */ 196 struct rb_root mm_rb; 197 struct vm_area_struct * mmap_cache; /* last find_vma result */ 198 unsigned long (*get_unmapped_area) (struct file *filp, 199 unsigned long addr, unsigned long len, 200 unsigned long pgoff, unsigned long flags); 201 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 202 unsigned long mmap_base; /* base of mmap area */ 203 unsigned long task_size; /* size of task vm space */ 204 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 205 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 206 pgd_t * pgd; 207 atomic_t mm_users; /* How many users with user space? */ 208 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 209 int map_count; /* number of VMAs */ 210 struct rw_semaphore mmap_sem; 211 spinlock_t page_table_lock; /* Protects page tables and some counters */ 212 213 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 214 * together off init_mm.mmlist, and are protected 215 * by mmlist_lock 216 */ 217 218 /* Special counters, in some configurations protected by the 219 * page_table_lock, in other configurations by being atomic. 220 */ 221 mm_counter_t _file_rss; 222 mm_counter_t _anon_rss; 223 224 unsigned long hiwater_rss; /* High-watermark of RSS usage */ 225 unsigned long hiwater_vm; /* High-water virtual memory usage */ 226 227 unsigned long total_vm, locked_vm, shared_vm, exec_vm; 228 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; 229 unsigned long start_code, end_code, start_data, end_data; 230 unsigned long start_brk, brk, start_stack; 231 unsigned long arg_start, arg_end, env_start, env_end; 232 233 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 234 235 cpumask_t cpu_vm_mask; 236 237 /* Architecture-specific MM context */ 238 mm_context_t context; 239 240 /* Swap token stuff */ 241 /* 242 * Last value of global fault stamp as seen by this process. 243 * In other words, this value gives an indication of how long 244 * it has been since this task got the token. 245 * Look at mm/thrash.c 246 */ 247 unsigned int faultstamp; 248 unsigned int token_priority; 249 unsigned int last_interval; 250 251 unsigned long flags; /* Must use atomic bitops to access the bits */ 252 253 struct core_state *core_state; /* coredumping support */ 254 255 /* aio bits */ 256 spinlock_t ioctx_lock; 257 struct hlist_head ioctx_list; 258 259#ifdef CONFIG_MM_OWNER 260 /* 261 * "owner" points to a task that is regarded as the canonical 262 * user/owner of this mm. All of the following must be true in 263 * order for it to be changed: 264 * 265 * current == mm->owner 266 * current->mm != mm 267 * new_owner->mm == mm 268 * new_owner->alloc_lock is held 269 */ 270 struct task_struct *owner; 271#endif 272 273#ifdef CONFIG_PROC_FS 274 /* store ref to file /proc/<pid>/exe symlink points to */ 275 struct file *exe_file; 276 unsigned long num_exe_file_vmas; 277#endif 278#ifdef CONFIG_MMU_NOTIFIER 279 struct mmu_notifier_mm *mmu_notifier_mm; 280#endif 281}; 282 283/* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ 284#define mm_cpumask(mm) (&(mm)->cpu_vm_mask) 285 286#endif /* _LINUX_MM_TYPES_H */ 287